According to the Scrum Guide, two activities that a Product Owner may engage in during a Sprint are updating management on what is being worked on and answering questions from the Development Team about items in the current Sprint. These activities are part of the Product Owner's responsibilities to manage and prioritize the Product Backlog, communicate with stakeholders, and collaborate with the Development Team. The other options are not activities that a Product Owner should engage in during a Sprint, as they are either done by the Scrum Master (such as running the Daily Scrum) or by the Development Team (such as prioritizing their work on the Sprint Backlog).

The correct answers are C, E, and F, because these phrases best describe the purpose of a definition of "Done". It creates transparency over the work inspected at the Sprint Review, as it defines what it means for an Increment to be potentially releasable. It guides the Development Team in creating a forecast at the Sprint Planning, as it helps them estimate how much work they can accomplish in a Sprint. It defines what it takes for an Increment to be ready for release, as it ensures that the product meets the quality expectations of the stakeholders.

According to the Scrum Guide1, when multiple Scrum Teams are working together on one product, they must coordinate their work with each other. One way to do this is through Nexus, a framework for scaling Scrum. Nexus helps to reduce cross-team dependencies and integration issues by making them more transparent. The key concern when multiple Development Teams are working from the same Product Backlog is minimizing dependencies between teams so that they can deliver an integrated Increment that meets the definition of "Done".